/Engine/Source/Runtime/RHI/Public/RHICommandList.h
FRHICommandCopyBufferRegion ( [FRHIBuffer](API\Runtime\RHI\FRHIBuffer) * InDestBuffer, uint64 InDstOffset, [FRHIBuffer](API\Runtime\RHI\FRHIBuffer) * InSourceBuffer, uint64 InSrcOffset, uint64 InNumBytes )